Abstract: This paper discusses methods used to estimate formation pressure in the scientific exploratory well. The optimum method was established for pressure calculation before,while and after drilling,which made the best use of geologic, seismic,logging, drilling,leak-off test,RFT and well kicks data,making the pressure calculation and analysis more systematic and more precise with each stage of drilling processes. The associated software package was developed to process formation pressure for practical wildcat planning and drilling. The difficulty of establishing accurate normal trend line was solved by recalculation and revision using RFT and well kicks data. MWD/LWD or log data was analyzed thoroughly to give as much information as possible for pressure calculating.Some models and methods for key parameters conversion (such as bulk density,shear wave velocity,shale contents and porosity both in permeale and impermeable formation)were developed in case of wanting, calculating from known measurements.

Key words: wildcat, pore pressure, fracture pressure, pressure prediction, log interpretation

摘要： 对地层压力的计算准确与否直接影响科学探索井钻井工程设计和正常施工,因而成为科学探索井的一个技术关键。本文在对地层上覆压力、孔隙压力及破裂压力有关计算模式理论研究分析基础上,结合科学探索井的施工实际情况,对压力计算模式进行了优选;建立了综合的钻前、随钻及钻后各环节压力计算的系统化、精确化方案;对计算破裂压力的一些关键参数转换模式进行了探索;形成了压力数据处理系统软件。通过在几口科学探索井进行实际应用,表明能够使地层压力的计算逐步精确化。

关键词: 探井, 孔隙压力, 破裂压力, 压力预测, 测井解释